KVM: Add statistics for guest irq injections

These can help show whether a guest is making progress or not.

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6022888..9b54550 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1519,6 +1519,7 @@ static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
 
        KVMTRACE_1D(INJ_VIRQ, &svm->vcpu, (u32)irq, handler);
 
+       ++svm->vcpu.stat.irq_injections;
        control = &svm->vmcb->control;
        control->int_vector = irq;
        control->int_ctl &= ~V_INTR_PRIO_MASK;

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 71e57ae..e7e8c86 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2341,6 +2341,7 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
 
        KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);
 
+       ++vcpu->stat.irq_injections;
        if (vcpu->arch.rmode.active) {
                vmx->rmode.irq.pending = true;
                vmx->rmode.irq.vector = irq;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e3b8966..3f3cb71 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -92,6 +92,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
        { "fpu_reload", VCPU_STAT(fpu_reload) },
        { "insn_emulation", VCPU_STAT(insn_emulation) },
        { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
+       { "irq_injections", VCPU_STAT(irq_injections) },
        { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
        { "mmu_pte_write", VM_STAT(mmu_pte_write) },
        { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index b6d26b8..68a3ac1 100644 (file)
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -413,6 +413,7 @@ struct kvm_vcpu_stat {
        u32 insn_emulation;
        u32 insn_emulation_fail;
        u32 hypercalls;
+       u32 irq_injections;
 };
 
 struct descriptor_table {